Clutch for loom pattern mechanisms



Nov. 29, 1927. I 1,651,120

P. E-IERiNG CLUTCH FOR LOOM PATTERN MECHANISM Filed March 21. 1927 Patented Nov. 29, 1927.

v UNITED STATES PATENT-OFFICE.

PAUL HERING, OLE METHUEN, MASSACHUSETTS, ASSIGNOR/ T CROMPTON & KNOWLES LOOlVI. WORKS, 0F WORCESTER, 'MASSA('JH.USETTS, A CORPORATION OI" MASSA- CHUSETTS.

CLUTCH.FOR LOOM'IPATTERN MECHANISMS.

Application filed March 21, 1927. Serial No. 176,955.

V This invention relates to improvements in a driving mechanism for dobby or head motions more particularly of the typeknown in the trade as the Knowles loom and shown in Patent 134,992 and it is the principal object of the invention to providev means for varying the rate to which the harnesses are moved and also the actual time in which they are moving.

The Knowles shaft-which is driven from the bottom shaft of the loom by a variable gearing usually provided with an elliptical gear on the bottom shaft which meshes with an eccentric gear on a stub shaft. The stub shaft has a miter gear which meshes with a second miter gear loose .on the bottom of the upright shaft. The harness and box motions of the loom are controlled by the upright shaft and any variation in the rotation ofsaid shaft will be communicated by means of mutilated cylinder gears to the harnesses or boxes. WVhen a hard twistfilling is being woven into the v cloth it is desirable to close the harnesses as soon as possible after the flight of the shuttle so that the filling will not have time to twist andcause kinks or lay unevenly in the cloth. On the other hand,where the width ofithe cloth is themaximum for which the loom is designed, as much time as possible must be allowed for the flight of the shuttle before the harness starts to close.

In order to provide for these varying con- .ditions the elliptical and eccentric gears are changed relatively to' the upright shaft. This has heretofore been accomplished in an awkward manner by lifting the upright shaft bodily so that the miter gear at the lower end thereof is out of mesh with the miter gear on the stub shaft. The upright shaft isthen given a slight angular movement equal to one or more teeth on the miter gears and is then lowered. This procedure requires a partial disassembling of the pattern mechanismand it is an important object of my present invention to provide for changing the angular relation of the upright shaft with respect to the elliptical and eccentricdriving gears" while the upright shaft is in its usual position. 1

It is a further object of my invention to provide :aremovable pin to connect the upright shaft with the miter at the lower end loomemploys an upright shaft '17.

thereof, said removable pin facilitating the aforementioned adj ustmen t.

WVith these and other objects which will appear as the description proceeds, my invention relates to the arrangements and combinations of parts hereinafter set forth, and

more particularly pointed out in the claims.

In the accompanying drawings Fig. l is a rear elevation of the pattern driving mechanism of a right end drive loom, parts being in section,

' Fig. 2 is a detailed section taken on line 2-2 of Fig. 1 showing. the eccentric pinion and the elliptical gear,

Fig. 3 is an enlarged top plan view of the clutch only, looking in the direction of arrow 3, Fig. 1,.

Fig. 4 is an enlarged horizontal section of line H of Fig. lshowing the collar only,

"Fig. 5 is an enlarged horizontal section of line 5-5 of Fig. 1 showingthe top of the miter gear which is loosely rotatable on the bottom of the upright shaft, and, I

Fig. 6 is a detail of the pin such as connects the'collar and miter gear on the upright shaft. I

Referring to the drawings, I have indicated loomframe 10 asprovided with a head frame 11 in which are journaled upper and lower cylinder'shafts 12 and 13, respectively.

The bottom shaft '14 is journaled in the frame and has adjustably secured thereto. by

means of set screws 1 5 an elliptical gear 15 which meshes with an eccentric pinion 16 of half the number of teeth, said pinion being. keyed or otherwise secured to a stub Said stub shaft extends through and rot-atesin bearing members 18 and 19 and has keyed to the outer end thereof a miter gear 20. Said bearing 19 is provided with an upwardly extending cup bearing 21 which receives the lower reduced endof the Said shaft has at the upright shaft 22. upper end thereof bevel gears 23 which are operatively connected to the cylinder shafts 12 and 13. i i

The lower end of the upright shaft 22' has a sliding clutchpin member 24 having a groove25 by means of which said member may be raised. by mechanism not shown. A second miter gear 26 is loosely rotatable on the lower end of shaft 22 and may be held in proper vertical position by means ofa collar clutch pin 41 which may be of the type shown inFigs. 1 and 6,wherein said pin is shown as having a reduced shank 42 and a threaded upper portion 43 which is received by a N correspondingly threaded opening inthe sliding clutch 24.

The loose miter gear member 26 is provided with a single hole 45 in the upper part thereof, said hole being proportioned to receive the pin 41. Said collar 40 is provided with a plurality of openings 46 which are disposed concentric with and parallel to the axis of the upright shaft 22, and each ofsaid openings 46 is proportioned to receive the reduced shank 42 of the pin 41.

The gear indicated generally at T is that usually employed in the so-called positive reverse worm take-up and may include a sleeve S the lower end of which lies closely 7 adjacent to the sliding member 24. When this construction is employed it will be desirable to use the removable pin .41, but if there is sufficient room above said member 24'so that'the same may be raised far enough for the pin to lie above the collar 40, then the pin need not necessarily be removable from the member 24.

In operation, the bottom shaft 14 will rotate once every twopicks of the loom, but the stub shaft 17' willbe given a complete revolution every pick of the loom. The miters 20 and 26 have the same number of teeth so that collar 40 and hence the upright shaft 22 will be given a revolution every pick of the loom. It may be assumed for purposes of explanation that the loom is Weaving the widest possible cloth so that the maximum time must be allowed for the flight of the shuttle and it may further be "assumed that when the eccentric and el'lipe tical gears are in the position shown in Fig. 2 the harnesses will start to, move. It will be seen from the relation set forth in Fig. 2

that the upright shaft will be given a'slow movement at the start so that the harnesses will start moving slowly to allow the shuttlefull time to pass through the shed. This relation of course is accompanied by a; clefinite. angular relation between the sliding member 24' and the collar 40, this relation being determined by the hole. 46 through which the pin 41 extends. If for any reason it should be necessary to change the drive necessary distance, after which the pin could be inserted in another of the holes 46, By

turning the shaft 22 the pin will be brought over the hole 45 in the miter gear 26 and the member 24 will slide downwardly to its cor reet position. This will of course leave the shaft out of time with r'espeetto the bot-tom shaft, but this may be corrected by loosening the set screwslfi andmalzing-an adjustment of the elliptical gear relatively to the bottom shaft so the upright shaft will be in proper time with respect tothe loom;

The result of this adjustment will be not only to vary the rate to which the upright shaft will be turning with respect to the bot tom shaft at the time the harnesses start to move but also there will be a change in the moved slower than those which are farthest i from said shaft and furthermore it will be seen that more of those teeth which are farthest from the bottom shaft will be -in-' c'luded in any given angle'than is true of the number of teeth nearest the bottom shaft which can be included in an angle ofthe same size. I

It will be seen that the adjustments ;de-' scribed can be effected Without disturbing the upright shaft 22 and that any desired fineness of adjustment can'be provided depending upon the number'of holes 46 which are located in the collar 40.-

From-the foregoing it will be seen that 1 have provided means for adjusting a drive for loom pattern mechanisms whereby the rate at which the harnesses are moving at any given instance 1n the tick may be changed and wherein the absolute time required for the crossing of the'harnesses may be varied, these results being achieved while the upright shaft member 22 isin its -bearings. Furthermore it will be seen that It have-provided an improved clutch pin for loom pattern mechanism rendering the'same removable so as to facilitate adjustments.

Having thus described my invention it will be apparent that changes and modifications may be made thereinby those skilled in the art without departing from the spirit I and scope of the invention, and I do not wish to be limited to the details'herein disclosed but what I claim is: V- n 1. In a 100m pattern driving pattern mechanism, a driving shaft, a driven shaft, driving connections between the shafts including an elliptical, gear adjustably held to the driving shaft meshing with an eecentric gear forming part of connections, a gear operatively connected to the eccentric gear and loosely mounted on the driven shaft, clutch means to c0nnect the loose gear to the driven shaft, and means to change the angular relation between the loose gear and the driven shaft. i

2. In a loom pattern driving pattern mechanism, a driving shaft, a driven shaft, driving connections between said shafts including a third stub shaft, means to drive the stub shaft at a variable rate with respect to the driving shaft, means to alter the angular relation of the stub shaft with respect to the driven shaft and means to adjust the variable gear.

3. In a loom pattern driving pattern mechanism, an elliptical gear mounted thereon and secured thereto in adjusted angular position, a stub shaft, an eccentric pinion secured to the stub shaft and meshing the elliptical gear, an upright driven shaft, a miter gear secured to the stub shaft, a sec ond miter gear loosely rotatable on the upright shaft and meshed with the first miter gear a collar secured to the upright shaft, and means to connect the collar and second named loose miter gear in plurality of angular positions.

4. In a loom pattern driving pattern mechanfsm, a driving shaft, a stub shaft,

gearing imposed between said shafts to give the stub shaft a variable speed relatively to the driving shaft, means to adjust the gearing relatively to the driving shaft, a driven upright shaft, driving connections between the stub and upright driven shafts, and means to give said upright and stub shafts a plurality of different angular positions.

5. In a loom pattern driving pattern mechanism, a driving shaft, a driven shaft, a miter gear to be operatively related to the driven shaft, means angularly adjustable with said gear and between shaft to give said gear a variable speed with respect to the bot tom shaft, a collar hitched to the upright driven shaft and having a plurality of openings thereto, a removable pin secured to the sleeve and proportioned to be received by any one of the openings in the collar and also to bereceived by an opening in the gear, and means to adjust the connections whereby said gear may be changed angularly with respect to the bobbin shaft.

In testimony whereof I have hereunto afiixed my signature.

PAUL HERING. 

